Following options are available in the script
a - curl ifconfig.me/all
c - curl ifconfig.me/charset
e - curl ifconfig.me/encoding
f - curl ifconfig.me/forwarded
h - help
i - curl ifconfig.me/ip
j - curl ifconfig.me/all/json
k - curl ifconfig.me/keepalive
l - curl ifconfig.me/lang
m - curl ifconfig.me/mime
o - curl ifconfig.me/connection
p - curl ifconfig.me/port
s - curl ifconfig.me/host
u - curl ifconfig.me/ua
v - curl ifconfig.me/via
x - curl ifconfig.me/all/xml/

TODO
* Print proper help usage
* Users should only be able to give one switch at a time